angular material 2、更改datepicker日期格式“MM/DD/YYYY"；到“DD/MM/YYYY"奇怪的行为 [英] angular material 2, change datepicker Date Format "MM/DD/YYYY" to "DD/MM/YYYY" strange behavior

问题描述

我只是尝试将 angular material 2 date-picker 默认日期格式 MM/DD/YYYY 更改为 DD/MM/YYYY 或 DD.MM.YYYY 或至少 DD-MM-YYYY

根据

I just tried to change the angular material 2 date-picker default Date Format MM/DD/YYYY to DD/MM/YYYY or DD.MM.YYYY or at least DD-MM-YYYY

According to this question and as mentioned in the documentation

providers: [{provide: MD_DATE_FORMATS, useValue: MY_NATIVE_DATE_FORMATS}]

So tried following approaches

Approach 1 plunkr : to get in DD-MM-YYYY format

Approach 2 plunkr : to get in DD.MM.YYYY format

Approach 3 plunkr : to get in DD/MM/YYYY format

but each of above approach working ordinary until I select a Date 1 to 12,

for ex: Today date is 25th September 2017, if I select 12th September 2017 as date, then once click datepicker button again I can see calender date, taken as 09th of November 2017(09/11/2017) not as (11/09/2017) , which is seems default date format not override correctly

解决方案

1/ DOCS: By cusomising the parse and display format with a custom date atapter

In the custom Date Adapter (yours is AppDateAdapter), add a parse method to parse the new date format (DD/MM/YYY) to a date valid date:

for example for the DD/MM/YYYY format, parse could be:

   parse(value: any): Date | null {
    if ((typeof value === 'string') && (value.indexOf('/') > -1)) {
      const str = value.split('/');
      const year = Number(str[2]);
      const month = Number(str[1]) - 1;
      const date = Number(str[0]);
      return new Date(year, month, date);
    }
    const timestamp = typeof value === 'number' ? value : Date.parse(value);
    return isNaN(timestamp) ? null : new Date(timestamp);
  }

working stackblitz: https://stackblitz.com/edit/angular-material-datepicker-format?embed=1&file=app/date.adapter.ts

your complete date adapter:

export class AppDateAdapter extends NativeDateAdapter {
    parse(value: any): Date | null {
        if ((typeof value === 'string') && (value.indexOf('/') > -1)) {
          const str = value.split('/');
          const year = Number(str[2]);
          const month = Number(str[1]) - 1;
          const date = Number(str[0]);
          return new Date(year, month, date);
        }
        const timestamp = typeof value === 'number' ? value : Date.parse(value);
        return isNaN(timestamp) ? null : new Date(timestamp);
      }
   format(date: Date, displayFormat: any): string {
       if (displayFormat == "input") {
           let day = date.getDate();
           let month = date.getMonth() + 1;
           let year = date.getFullYear();
           return this._to2digit(day) + '/' + this._to2digit(month) + '/' + year;
       } else {
           return date.toDateString();
       }
   }

   private _to2digit(n: number) {
       return ('00' + n).slice(-2);
   } 
}

The advantage of this approach is you could also custom the format of monthYearLabel in the display constants and could have a calendar which looks like:

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